How to Grow Magnum Autoflower
Magnum Autoflower is a 60% sativa-dominant autoflowering strain. Its exact parentage is not publicly documented, but its grow traits are well mapped: a THC level of 12 to 14%, placing it in the low range, and a creative, energetic and uplifted effect over a sweet, citrus and spicy flavor. This guide walks you through the whole grow, from germinating the seeds to the final cure.
As an autoflower it is fast and forgiving: it finishes its full life cycle in 8 to 10 weeks from seed, reaches around 1.5 m, flowers on its own schedule without a light change, and gives a reliable medium yield. Its low THC and easy nature make it a friendly pick for first-time growers.
Recommended Strains
Magnum Autoflower
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THC | 12% - 14% (Low) |
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Type | Autoflowering |
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Yield | Medium |
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Phenotype | 40% Indica / 60% Sativa |
Afghan Autoflower
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THC | 15% - 17% (Medium) |
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Type | Autoflowering |
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Yield | Medium |
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Phenotype | 90% Indica / 10% Sativa |
Magnum Autoflower at a Glance
Before you plant anything, it helps to see the full picture in one place. Here is the quick profile for this sativa-leaning autoflower, taken straight from the strain’s grow data.
| Seed type | Autoflowering (feminized) |
|---|---|
| Genetics | Undisclosed |
| Phenotype | 60% Sativa / 40% Indica |
| THC | 12–14% (low) |
| Life cycle | 8–10 weeks from seed |
| Harvest | All season |
| Height | up to 4.92 ft (1.5 m) |
| Yield indoor | 1.15–1.31 oz/ft² |
| Yield outdoor | 14.11–21.16 oz/plant |
| Climate | Temperate |
| Flavors | Citrus, Spicy, Sweet |
| Effects | Creative, Energetic, Uplifted |
| Difficulty | Beginner-friendly |
These are autoflowering seeds, so they flower on age rather than a light change and race from seed to harvest. They are also feminized seeds, so every plant comes out female. Its 60% sativa lean places it among the sativa seeds, and if you are still weighing your options you can compare it with the rest of the catalog and find your strain.
Promos & Deals
How to Germinate Magnum Autoflower Seeds
A good harvest starts at germination, and with an autoflower it pays to be gentle because the plant is on the clock from day one. The paper towel method works well: fold the Magnum Autoflower seeds inside two damp sheets, slide them between two plates, and keep them dark at 70 to 79°F. A taproot usually shows in two to five days.
The key autoflower rule: sow the sprouted seed straight into its final pot. Autos dislike transplanting, and moving them wastes days of a short life cycle. Place the taproot down about 1 cm deep in light, airy medium, keep it lightly moist rather than soaked, and give soft light as the first true leaves open.
Starter tips
- Plant directly in the final container to avoid transplant shock.
- Use plain, lightly pH-balanced water (pH 5.5 to 6.5) for the first week.
- Keep seedlings warm and humid, but never waterlogged.
Growing Magnum Autoflower in the Vegetative Stage
Autoflowers do not wait for a light change, so the whole life cycle runs on a long photoperiod. Give Magnum Autoflower 18 to 20 hours of light a day from seedling to harvest. Aim for day temperatures of 68 to 79°F and humidity around 50 to 60% while it builds its frame. As a 60% sativa it tends to stretch and grow lanky, reaching up to about 1.5 m.
The veg window is brief, usually two to four weeks, so train gently. Skip topping, which stresses an auto and can stall it; instead use low-stress training, tucking and tying the taller branches down to even out the canopy and let light reach the lower bud sites. This also helps keep a stretchy sativa manageable. Keep nutrients light at this stage and let the plant set its own pace.
Its sativa stretch and all-season nature make it flexible both indoors and out:
- Southern California and the Southwest: long, warm days suit an auto perfectly, and you can fit two or more runs in a single season.
- Pacific Northwest and cooler states: because it ignores daylight length, you can plant after the cold snaps and still harvest before autumn damp sets in.
- Indoor tents: plan for its stretch and use LST early so the sativa frame does not outgrow your space.
Flowering and Buds of Magnum Autoflower
With an autoflower you do nothing to trigger bloom: Magnum Autoflower starts flowering on its own around three to four weeks from seed, with no change to the light schedule. The full life cycle wraps in 8 to 10 weeks from seed, and because it is all-season you can run it at almost any time of year.
Through flowering, keep the 18 to 20 hour light, drop humidity to 40 to 45%, and keep air moving so the buds stay clean. It forms the long, airy flowers typical of a sativa, carrying a sweet, citrus aroma with a spicy edge.
At 12 to 14% THC it sits in the low range, giving a light, clear and sociable effect, creative, energetic and uplifted, rather than anything heavy.
Common Problems and Pro Tips
Magnum Autoflower is beginner-friendly, but its sativa stretch and autoflower nature mean a few things are worth planning for.
- No recovery time: an auto will not wait for you to fix a mistake, so keep feeding light and conditions steady rather than chasing problems.
- Manage the stretch: as a sativa it can get lanky, so use low-stress training early to keep an even canopy and good light penetration.
- Do not top it: stick to LST; heavy techniques can stall a plant that is already on a tight clock.
Expert tip: the fastest way to lose yield with an auto is overfeeding early. Start with half-strength nutrients, let the plant tell you when it wants more, and spend your effort on gentle LST and a clean final pot rather than training heroics.
Aroma, Flavor and Effects
The nose is bright and lively: a sweet, citrus top note with a warm, spicy edge underneath. It smells fresh and zesty rather than heavy, and the sweetness builds as the buds cure.
The flavor follows the nose, sweet and citrus with a spicy finish. On the effect side it is creative, energetic and uplifted, a bright, clear-headed sativa feel that suits daytime use. Because THC runs a low 12 to 14%, it stays mellow and very approachable, a good choice for a gentle, functional session.
Dominant terpenes
Magnum Autoflower carries a short but characterful terpene profile built on two main players. Myrcene lays down a soft, sweet, slightly fruity base, while Caryophyllene brings the warm, peppery spice that gives the strain its zesty edge. Together these two shape its sweet-citrus-and-spice character.
Nutrient Schedule
Treat the figures below as a starting map, not a rulebook, and with an auto err on the light side. Magnum Autoflower is a fast plant, so read it closely: tip burn means back off, while pale, slow growth means it wants a little more. All values use EC.
| Stage | EC |
|---|---|
| Seedling | 0.4–0.6 |
| Growth | 0.8–1.2 |
| Early flower | 1.2–1.4 |
| Full flower | 1.4–1.6 |
| Flush | 0.0–0.4 |
Keep the pH around 6.0 to 6.5 in soil and 5.5 to 6.0 in hydro so the roots can actually take up what you feed.
What to Do With Your Trim: Extracts and Hash
Even at a medium yield, Magnum Autoflower puts down enough resin that its trim is worth keeping rather than tossing. The sugar leaves you take off while manicuring hold trichomes and suit Ice Water Hash, where cold water and agitation separate the resin heads into a clean, solventless concentrate. Pressing that hash into rosin keeps the sweet citrus flavor intact, or you can run a solvent extraction if that is your setup. The bare stems will not extract, but chopped and composted they feed organic matter back into the soil for your next grow.
Harvesting, Drying and Curing Magnum Autoflower
Timing the harvest comes down to the trichomes. Grab a loupe and watch the heads turn from clear to milky white; a scattering of amber signals peak ripeness. With this auto that usually lands 8 to 10 weeks from seed, and because it is all-season you simply harvest when the plant is ready rather than by a calendar month.
After the cut, hang the branches in a dark room at 59 to 68°F with humidity near 50% and gentle air movement. Slow beats fast: drying over 10 to 14 days protects the sweet citrus and spicy aromas that define this strain. When the small stems snap instead of bending, move the buds into jars.
Cure in sealed glass, opening the jars daily for the first week to let moisture escape, then easing off as the aroma deepens. Two to four weeks of patience here is where the sweet citrus and warm spice really come forward, and it is the step most first-time growers rush.
Frequently Asked Questions
Is Magnum Autoflower a true autoflower?
Yes, Magnum Autoflower is a true autoflowering strain. It flowers based on age rather than a change in the light cycle, so you do not switch it to 12/12. It starts blooming on its own around three to four weeks from seed and finishes its full life cycle in 8 to 10 weeks from seed.
How long does Magnum Autoflower take to grow?
Magnum Autoflower completes its whole life cycle in 8 to 10 weeks from seed, from germination to harvest. Because it is an all-season autoflower, you can plant it at almost any time of year and, in warm climates, fit more than one run into a single season.
How strong is Magnum Autoflower?
Magnum Autoflower has a THC level of 12 to 14%, which places it in the low range. The effect is creative, energetic and uplifted, a light, clear-headed sativa feel rather than a heavy one. That low potency makes it a very gentle, approachable strain, well suited to daytime and to newer users.
How much does Magnum Autoflower yield?
Magnum Autoflower gives a reliable medium yield. Indoors it produces around 1.15 to 1.31 oz/ft², and outdoors it reaches roughly 14.11 to 21.16 oz per plant in good conditions. Giving it 18 to 20 hours of light and early low-stress training is what helps it hit its full potential.
Can I top Magnum Autoflower?
It is better not to. Autoflowers run on a tight clock and topping can stress the plant and stall its growth. Instead use low-stress training: gently tuck and tie the taller sativa branches down to even the canopy and expose lower bud sites. This lifts the yield without the setback that heavy techniques cause.
What does Magnum Autoflower taste and smell like?
Magnum Autoflower leads with a bright, sweet citrus aroma lifted by a warm, spicy edge. It smells fresh and zesty rather than heavy or earthy. Both the aroma and the sweet citrus-and-spice flavor deepen as the buds cure slowly in the jar after harvest.
